Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa09f1bc0179c6cf3904fee72452296a84b40427e1fd83edf1a2c07dd990283' 
  AND token = '3UzzLBTFIesDdz08fyKdDQ+nsRy2Q+PBsDFUgZ1dtAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}